var tabber = {
    switch_tab : function (o) {
        //var tabs = document.getElementsByClassName('tabbercontent');
        var act_tab = document.getElementsByClassName('tabbercontent_active');
        for(var i=0; i<act_tab.length; i++)
            act_tab[i].className = 'tabbercontent';
        $(o).className = 'tabbercontent_active';
    }
}
